Modifications you've done or had done...

[roweenie]

Thanks for your kind words, Tabor - no, I had a scrap piece of tubing I wanted to use elsewhere, but I think I know where in the 4th valve circuit you were thinking of....

Argh, Bob, why did you have to show me that Website... I'm in trouble...

Sorry........?

[roweenie]

Yes, I think that's a good estimate. Actually, I'm going to wait until it's all put together, and check it against a tuner.

I was trying (operative word trying) to use the formulas contained in Art Hovey's excellent website, but unfortunately my math (algebra in particular) skills aren't quite so excellent.....

[MikeMason]

On my wiseman: larger bell to body brace- original too small and smushed in to bell in shipping,2 small braces on leadpipe- it was a bit too wiggly for me to feel good about carrying in a dent bag, MAW valves- I have never had smoother valves. Horn plays marginally better, but the feel is like heaven. My 2j is having a fifth valve added right now.

[roweenie]

My 2j is having a fifth valve added right now.

That's awesome - be sure to post some pictures when you get it back....

[tubapix]

Just swapped the silicone bumpers on rotary valves (Yamaha YBB-641) with a harder rubber.
Not much of a change, but it makes a huge difference in action (and speed). And it even doesn't make much more noise...

What did you use for the rubber? I have been wanting to do the same on mine.

[Heliconer]

https://imgur.com/gallery/dG3r8

This started as a 3 banger. Currently adding a 4th valve to a fixed bell Martin Mammoth.

[Tabor]

https://imgur.com/gallery/dG3r8

This started as a 3 banger. Currently adding a 4th valve to a fixed bell Martin Mammoth.

Nice tuba. Have you seen the big Martin on Youtube done in Brazil using the Weril-made Nirschl cluster & all shined up? It is a looker.

[Tubajug]

https://imgur.com/gallery/dG3r8

This started as a 3 banger. Currently adding a 4th valve to a fixed bell Martin Mammoth.

Very nice! What are the valves from?